[ntp:questions] why do internet servers not poll at longer intervals
Ron Frazier (NTP)
timekeepingntplist at c3energy.com
Wed Feb 15 08:42:57 UTC 2012
On 2/15/2012 3:23 AM, David J Taylor wrote:
>> +nist1-ny.ustimi .ACTS. 1 u 25 64 377 53.990
>> 3.458 6.160
>> #18.104.22.168 .ACTS. 1 u 42 64 377 59.998
>> 22.534 5.595
>> +india.colorado. .ACTS. 1 u 36 64 377 63.986
>> 1.739 6.604
>> +ping-audit-207- .ACTS. 1 u 50 64 377 83.998
>> 0.715 3.206
> What Internet connection do you have? I see delays of 25 - 35 ms on
> my cable modem connection, which is 30 Mb/s down and 1 Mb/s up. I
> don't know whether delays of 54 - 84 ms are what would be expected on
> your connection, but they seem long delays to me. It may be worth
> checking whether your ISP has an NTP server. Sometime stratum-1 NTP
> servers can get overloaded because too many people connect to them,
> and stratum-2 servers will give better results (especially if they are
> better connected to you).
My PC connects to my basement router with wifi G, which is then wired to
a wired router which is wired to the cable modem. Service is Comcast
16-20 Mbps down and 3-4 Mbps up. I get pretty low jitter to the NY NIST
server, which is the one this machine normally hits if there is no GPS.
I'm not sure if Comcast has a public NTP server or not.
(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such. I don't always see new messages very quickly. If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)
timekeepingdude AT c3energy.com
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